Construct in-session window title from scratch, not cumulatively.

remoting/webapp/client_screen.js

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /**
  * @fileoverview
  * Functions related to the 'client screen' for Chromoting.
  */
 
 'use strict';
@@ skipping 508 matching lines @@
   // won't find the hostId. If the user clicked on the entry for the local host
   // immediately after having enabled it then we won't know it's JID or public
   // key until the host heartbeats and we pull a fresh host list.
   if (!host || !host.jabberId || !host.publicKey) {
     retryConnectOrReportOffline_();
     return;
   }
   remoting.hostJid = host.jabberId;
   remoting.hostPublicKey = host.publicKey;
   document.getElementById('connected-to').innerText = host.hostName;
-  document.title = document.title + ': ' + host.hostName;
+  document.title = chrome.i18n.getMessage('PRODUCT_NAME') + ': ' +
+      host.hostName;
 
   remoting.WcsLoader.load(connectMe2MeWithAccessToken_);
 };
 
 /**
  * Continue making the connection to a host, once WCS has initialized.
  *
  * @param {string?} token The OAuth2 access token, or null if an error occurred.
  * @return {void} Nothing.
  */
 function connectMe2MeWithAccessToken_(token) {
   if (token) {
     /** @type {string} */
     var pin = document.getElementById('pin-entry').value;
 
     remoting.clientSession =
         new remoting.ClientSession(
             remoting.hostJid, remoting.hostPublicKey,
             pin, 'spake2_hmac,spake2_plain', remoting.hostId,
             /** @type {string} */ (remoting.oauth2.getCachedEmail()),
             remoting.ClientSession.Mode.ME2ME, onClientStateChange_);
     remoting.clientSession.createPluginAndConnect(
         document.getElementById('session-mode'),
         token);
   } else {
     showConnectError_(remoting.Error.AUTHENTICATION_FAILED);
   }
 }